Member Avatar for ricardoemilio

Own Dell Optiplex desktop GX 280 ( bios A04 (02/09/05). Bios has administrator password which I don't know. Tried using backdoor password, third party software for revealing password, no luck. Disconnected CMOS battery which changed date and time but did not remove the administration password locked BIOS. Could not find BIOS clearing junpers on motherboard which I don't know if that could solve the problem, which is to be able to change the boot order so I can reinstall windows xp. Any help will be appreciated from this forum since I have run out of options short of replacing the motherboard or the computer itself.

ricardoemilio

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Good troubleshooting by — the outcome matches Dell’s documented procedure for older OptiPlex models. The GX280 user/service documentation shows a password jumper (PSWD) and an RTC‑reset/RTCRST grouping on the system board; the manual and Dell support threads describe using those jumpers to clear setup/admin password and reset NVRAM. See the GX280 manuals and Dell community guidance for the exact board diagram and the vendor‑recommended sequence.
Dell OptiPlex GX280 — Manuals & User's Guide · How do I clear the BIOS password on a GX280? (Dell Community)

Practical checklist and safety pointers (summary of what the docs recommend and what to watch for): power the PC down and unplug it, remove the chassis cover, identify the PSWD/RTCRST pins using the system‑board diagram for your chassis type, use proper ESD precautions, and follow the manual’s jumper/RTCRST steps (the manual also recommends pressing the power button once after unplugging to discharge the board before changing jumper settings). After the reset sequence, restore the jumper to its normal position and verify BIOS settings. Refer to the board diagram for the exact jumper location for your form factor.
(GX280 board map and jumper notes shown in the service/user documentation.)
GX280 system‑board components (manual excerpt) · How To Reset the NVRAM on Optiplex Systems (Dell Community)

If you can’t find a jumper or the password still blocks changes, the password may be stored differently (EEPROM/service procedure). Newer Dell models (and some later BIOS versions) use a vendor service/reset code workflow and may require contacting Dell with proof of ownership to get an unlock/reset code. Also note that a BIOS/admin jumper reset does not necessarily remove a hard‑drive (ATA/NVMe) hardware password — HDD passwords and BIOS/admin passwords are separate and HDD passwords can put your data at risk if lost.
Dell community: BIOS password policy/changes · Dell: Hard‑drive vs BIOS password guidance

If the immediate goal was reinstalling Windows, use the one‑time Boot Menu (F12 on GX280 at POST) to boot from the optical drive or a bootable USB (if supported) without permanently changing BIOS order — this is handy while you work through password/jumper steps.
Boot menu / F12 instructions for GX280 (manual excerpt)

Notes tied to earlier replies: ’s point about boot order and temporarily booting to installation media is valid, and ’s reminder that jumper settings affect BIOS state echoes the official docs — consult the GX280 user/service guide before moving pins.

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Member Avatar for Xlphos

Hello,

If the hard drive is in the boot list then you should be able to install XP on the hard drive and it will boot from that. Or is the problem that the hard drive is before the CD/DVD drive in the boot list?

- Let us know how it goes.

Member Avatar for ricardoemilio

The hard drive was first in the boot list but bios also had an administrator password protection. I found an article by dell explaining how to solve this. The motherboard has a jumper that controls the administration password in bios. I removed the jumper, re-started the computer and was able to change boot order.

Ricardoemilio

Member Avatar for savis1

Yes, the changing the jumper settings will change the BIOS settings. You can find the jumper in the motherboard.

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